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/* Copyright 2022 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "charger.h"
#include "driver/charger/rt9490.h"
#include "hooks.h"
#include "i2c.h"
#include "system.h"
static void enter_hidden_mode(void)
{
i2c_write8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
0xF1, 0x69);
i2c_write8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
0xF2, 0x96);
}
/* b/194967754#comment5: work around for IBUS ADC unstable issue */
static void ibus_adc_workaround(void)
{
if (system_get_board_version() != 0) {
return;
}
i2c_update8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
RT9490_REG_ADC_CHANNEL0,
RT9490_VSYS_ADC_DIS,
MASK_SET);
enter_hidden_mode();
/* undocumented registers... */
i2c_write8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
0x52, 0xC4);
i2c_update8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
RT9490_REG_ADC_CHANNEL0,
RT9490_VSYS_ADC_DIS,
MASK_CLR);
}
/* b/214880220#comment44: lock i2c at 400khz */
static void i2c_speed_workaround(void)
{
/*
* This workaround can be applied to all version of RT9490 in our cases
* no need to identify chip version.
*/
enter_hidden_mode();
/* Set to Auto mode, default run at 400kHz */
i2c_write8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
0x71, 0x22);
/* Manually select for 400kHz, valid only when 0x71[7] == 1 */
i2c_write8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
0xF7, 0x14);
}
static void pwm_freq_workaround(void)
{
/* Reduce SW freq from 1.5MHz to 1MHz
* for 10% higher current rating b/215294785
*/
rt9490_enable_pwm_1mhz(CHARGER_SOLO, true);
}
static void eoc_deglitch_workaround(void)
{
if (system_get_board_version() != 1) {
return;
}
/* set end-of-charge deglitch time to 2ms */
i2c_update8(chg_chips[CHARGER_SOLO].i2c_port,
chg_chips[CHARGER_SOLO].i2c_addr_flags,
RT9490_REG_ADD_CTRL0,
RT9490_TD_EOC,
MASK_CLR);
}
static void board_rt9490_workaround(void)
{
ibus_adc_workaround();
i2c_speed_workaround();
pwm_freq_workaround();
eoc_deglitch_workaround();
}
DECLARE_HOOK(HOOK_INIT, board_rt9490_workaround, HOOK_PRIO_DEFAULT);
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